Links Xcode SDKs from the /SDKs directory (which you maintain yourself)

fix-xcode

#!/usr/bin/python

# fix-xcode
# 	Rob Napier <robnapier@gmail.com>

# Script to link in all your old SDKs every time you upgrade Xcode
# Create a directory called /SDKs (or modify source_path).
# Under it, put all the platform directories:
# 	MacOSX.platform          iPhoneOS.platform        iPhoneSimulator.platform
# Under those, store the SDKs:
#	MacOSX10.4u.sdk MacOSX10.5.sdk  MacOSX10.6.sdk  MacOSX10.7.sdk  MacOSX10.8.sdk
#
# After upgrading Xcode, just run fix-xcode.

import argparse
import subprocess
import os

source_path = "/SDKs"

parser = argparse.ArgumentParser()
parser.add_argument('xcodePath', help='path to Xcode', nargs='?')
args = parser.parse_args()

if args.xcodePath:
	dest_path = args.xcodePath
else:
	dest_path = subprocess.check_output(["xcode-select", "--print-path"]).rstrip()

if not dest_path.endswith("/Contents/Developer"):
	dest_path += "/Contents/Developer"

for platform in os.listdir(source_path):
	subprocess.call("sudo ln -sf %(source_path)s/%(platform)s/* %(dest_path)s/Platforms/%(platform)s/Developer/SDKs" % locals(), shell=True)

Included on this page are commands to use for altering the Info.plist. Integration into the script should be straightforward, hmm, maybe except for parsing the version number out of the SDK path.

This not work for xcode12